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  <a href="http://sudopedia.enjoysudoku.com/Nishio.html">Nishio Forcing Chains</a>
  <p>
   We can prove that the following assertions are both true:
   <ul>
    <li>If {0} then {1}
    <li>If {0} then {2}
   </ul>
   Because the assertions obviously contradict each other the assumption "{0}" must be incorrect and it follows that <b>{3}</b>.<br/>
   Each assertion is proven by a one or several forcing chains which are Nishio chains because they involve a single candidate only.
  <p>
   <b>Details of Chain 1 (View 1):</b><br>
   {4}
  </p>
  <p>
   <b>Details of Chain 2 (View 2):</b><br>
   {5}
  </p>
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